Updated story

Two young children have been found stabbed to death inside a Naperville home and police have taken their babysitter into custody for questioning Wednesday morning.

The children, ages 5 and 7 or 8, were discovered late Tuesday night by Naperville police during a well-being check, reports the Chicago Sun-Times. Both children were pronounced dead at the scene.

The babysitter's child is among the victims, while the other belonged to a mother who had left for work and put her child in the sitter's care. According to WGN reports, the babysitter stabbed her own child and a child she was watching.

The Sun-Times reports two dogs were also found killed inside the home.

Naperville police do not think there are other suspects are at large, writes the Associated Press.

According to Patch, the younger child was a kindergartener at Brookdale Elementary School. The older child attended a school in Naperville District 203.

Naperville Police Sgt. Louis Cammiso told the Chicago Tribune that community members have no reason to fear for their safety and that the tragedy is "isolated and contained."

This is a developing story.

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